I: | Current availability of carbon dioxide levels is limiting to the C4 plants. |
II: | C3 plants have a much lower temperature optimum than C4 plants. |
1. | Only I is correct | 2. | Only II is correct |
3. | Both I and II are correct | 4. | Both I and II are incorrect |
1. | There is a linear relationship between incident light and carbon dioxide fixation rates at low light intensities. |
2. | Current availability of carbon dioxide levels is limiting to the C4 plants. |
3. | C4 plants respond to higher temperatures and show higher rates of photosynthesis |
4. | Water stress causes the stomata to close, hence reducing the availability of carbon dioxide |
Consider the two statements:
I. Elevated atmospheric CO2 increases the instantaneous rate of photosynthesis in C3 plants.
II. Current availability of atmospheric CO2 level is limiting to the C3 plants.
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect